Looking for nickel wire NP2, 0,025 mm, EXW

We are looking for Nickel wire NP2 99,86% purity 0.025 mm in diameter. If you can supply kindly advise:
1. the Isotopic composition specifications
 2. the total impurities: (Mg, Na, Cu, B, C, N, O, etc)
3. the payment terms